Wordsworth suppliod his Lyrical Ballads with sovoral Advortisoments and Prefaces, which were meant to serve as guides for the better under-standing of his poems. In this Thosis I have chosen to consider the 1800 Proface, or the Preface to the Second Edition of the Lyrical Ballads, because it contains Wordsworth's theories upon the principles of Poetry. Wordsworth and Coleridge planned to compose a volume of Poetry which would be different in its subject mattor and language from existing poems; it was to be free from conventional imagery and terminology. Coleridge's well known contribution to the Lyrical Ballads is the Ancient Marinor, which I shall not discuss in this Thesis. I have selected a fow of Wordsworth's poems from the Lyrical Ballas to illustrate my study of cortain aspects of tho 1800 Preface. These poems are Michael, The Idiot, Boy, The Thorn, The Brothers, and Resolution and Indopordonce. I have also taken some passages from The Prelude.